Translate examples/std_misc/file/open/open.rs
Translate examples/std_misc/file/open/open.rs

rust-lang-cn/rust-by-example-cn,aakloxu/rust-by-example-cn,rust-lang-cn/rust-by-example-cn,jinyuanxie/rust-by-example-cn,aakloxu/rust-by-example-cn,jinyuanxie/rust-by-example-cn